public with sharing class StoreFront {
	public String message { get; set; }
	public PageReference shop() {
		message = 'You bought: ';
		for (DisplayMerchandise p: products) {
			if (p.count > 0) {
				message += p.merchandise.name + '（' + p.count + '）　　　　';
			}
		}
		return null;
	}
	
	DisplayMerchandise[] products;
	public class DisplayMerchandise {
		public Merchandise__c merchandise { get; set; }
		public Decimal count { get; set; }
		public DisplayMerchandise(Merchandise__c item) {
			this.merchandise = item;
		}
	}
	
	public displayMerchandise[] getProducts() {
		if (products == null) {
			products = new DisplayMerchandise[]{};
			for (Merchandise__c item :
			[SELECT id, name, description__c, price__c
			 FROM Merchandise__c
			 WHERE TotalInventory__c > 0]) {
			 	products.add(new DisplayMerchandise(item));
			 }
		}
		return products;
	}
}